Wooten-fire-box arch.



A.' H. WILLEN'. womw rma Box Anc.

APPLICATION-'FILED FEB. Il, |916. A Y

Patented June 12, 191?.

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'A. H. WILLETT. WOOTEN FIRE BOX ARCH. APPucATgml FILED Fes. 1|, 1915'.

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PatentedJune 12, 1917.

@Ef/C65 E ALFRED H. WILLETT, OF WEST NEW YORK, NEW JERSEY, ASSIGNOR TO AMERICAN ARCH COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

WOOTEN-FIRE-BOX ARCH.

Specification of Letters Patent.

Patented J une 12, 191'?.

Application led February 11, 1916. Serial No. 77,643.

To all whom it may concern:

Be. it known that I, ALFRED H. VILLETT, a. citizen of the United States, and a resident of West New York, county of Hudson, and State of N cw Jersey, have invented certain new andv useful Improvements in and for YV oote11-l"irc-Box Arches, of which the following is a specification.

My invention relates to improvements in locomotive boilers of the lVooten type which have irebox extensions within the barrel of the boiler forward of the grate.

The irebox of a lVooten type boiler differs from others chiefly in the matter of its height. The distance between the grate and y the crown sheet is much less than in locomotivo fireboxcs of other types. The reason 0f this peculiarity is that lVooten tireboxes are designed for use with anthracite coal; a fuel which yields a very short flame, as compared with others, and which therefore necessitates thearrangement of the chief heating surface (the crown sheet) close to the fuel bed. The height of the firebox eX- tension, sometimes called the combustion chamber extension, is determined by the height of the crown sheet, as in other fireboxes. Another characteristic of a Wooten iirebox is that the grate is placed almost on a level with the floor of the extension, and the throat sheet is extremely narrow.

It is lclaimed for the lVooten type irebox that by reason of its low height and narrow throat sheet there is a substantially equal distribution of the hot gases in the fines of the boiler; and that this and the attendant easy maintenance of the filles and the flue sheet, are advantages secured without material loss of heating value in the` walls of the irebox, inasmuch as the latter are close to the fuel bed. Against the admitted advan tages of such tireboxes, I find that the flow of hot gases from grate to iues is so rapid and direct that the rear part of a Wooten firebox is milch less eii'ective than Supposed.

It has been suggested that a cure may be effected by )roviding lVooten ireboxes with inclined re ractory arches of the kind used in bituminous coal burning locomotives and which in such locomotives have served to Obviate disadvantages similar to those here mentioned as pertaining to Voot'en lireboxes. But extensive experiments conducted in the past have made it appear that the lack of height "in the W'ooten irebox, and its narrow throat sheet, prevent the practical and eliicient use of such arches. Wooten fireboXes of the extensiontype are therefore customarily used without arches or baflie walls of any kind.

The object of my invention is to provide within a lVooten type ircbox a. combination fire wall and arch which shall perform the same desirable functions as the arches which i are used in bituminous coal-burning tireboxes.

The manner in which I attain this object, and the nature and particulars of my invention, will be understood on reference to the drawings that form part of this speeication and in which Figure l is a transverse section on the line U-U of Fig. 2 of a Wooten-type firebox embodying my invention;-Fig. 2 is a longitudinal section on the line X-X of F ig. l;-Fig. 3 is a sectional detail on the line Y-Y of Fig. 2;- and Fig. -l is a horizontal section on the irregular line Z-Z of Fig. l.

The familiar parts of a vWooten type irebox are as follows The boiler-barrel, 2;- the tirebox shell, 3;-the. mud ring, 4;-the side sheets, 5, 5;-the crown sheet, 6;-the rear sheet, 7;-side water legs, 8, 8;-the front water leg, 9;-the fuel door, 10 g-and throat sheet, 11 ;-tlie rear water leg, l2;- the so-called lire-box extension, of which 13 is the floor;*the fiue sheet, 14 ;hand, the tlues, l5. The grate, 1G, indicated by dotted lines, usually occupies the whole space within the confines of the mud ring, extending from side to side of the lirebox and from the rear sheet, 7, to the throat sheet, l1. .The iireboX-extension is all that part of the firebox between the fine sheet, 14, and the throat attempting to employ a refractory arch ex* tending upwardly and rearwardly from the lower part of the throat sheet, 11,v I first divide the lirebox into fire and combustion chambers by means of a vertical wall, A, composed of refractory bricks, and positioned in the tireboXeXtension- I then construct an over-hanging arch, B, rearwardly of the wall. My invention is chieiiy concerne'd with the means for supporting the overhanging arch.

The cross wall, A, may be of any desired construction. But I prefer that in all cases it shall be provided with a clean-out opening, A', through which the combustion chamber may be reached. The overhanging arch, B, to be practical, must be composed of sectional arch bricks. Heretofore there has been no practical way of supporting such bricks inf"the upper part of the wide tirebox.

I overcome the many diliculties presented by using a. plurality of longitudinally extending water circulating arch tubes some of which (the middle group) rise from` the floor, 13, of the irebox barrel or extension, whileouter tubes extend rearward directly fromv those portions of the throat sheet which are at the sides of the extension. Upon these arch tubes I arrange the refractory bricks which compose the body of the overhanging arch, B.

The arch tubes, C, D, and, E, are those which rise from the loor of the extension. These tubes are curved upwardly and backwardly and pass through or over the wall, A, approximately half way of the height between the grate and the crown sheet. From that level the tubes slant upwardly, and their ends are fastened in the upper part of the rear sheet, 7. These tubes, C, D, and, E, support two longitudinal rows, F and G, of arch component bricks, H. y

The tubes, I and J, are the outer tubes above referred to. These are secured in re spective wings, l1', of the throat sheet, 1l,

at points far enough above the grate to al-y low ample fuel and ire clearance. It should be noted that the ends of the tubes, I and J, are secured in the throat sheet at points far enough toward the outside to allow them to be reached through plugged openings, I,

' and', J in the breast plate, 3, at the sides of the boiler shell, 2. Unless positioned in this manner, the tubes, I and J, could not well be employed, for such tubes must be accessible from the exterior of the boiler; otherwise, they could not be secured in place and otherwise they could not easily be cleaned.

From the points where they are fastened in the throat sheet the tubes, I and J, curve upward to the level of their straightpor tions and the straight port-ions of the three tubes, C, I) and E. The rear ends of the v tubes, I and J, are fastened in the rear sheet, 7, and are accessible through normally plugged openings in the rear end of the irebox shell. The upwardly curved front end, J a, of the tube, J, clearly appears in Fig. 2.

My purpose in curving or bending the tubes, I and J, in this manner is to provide that diierence in elevation between the front and rear ends which is necessary to insure It will he clear that the trout ends of the tubes, I and J, are below the correspomling parts of the middle tubes and therefore do not provide proper supports for arch bricks. Therefore upon the bend of each outer tube I place a leveling or saddle brick, K. the top, K, of which is substantially level with the tops of the tubes, (l, I), and E, and in alinement with the tops of the straight portions of the tubes. I and J. The saddle bricks abut the throat sheet. 11. Their undersides are grooved to lit the tops of respective tubes. (See Fig.

The spaces between the tubes, I, and J, andvrespective side sheets, 5, are closed by marginal bricks, L, some of which rest upon the saddle bricks, K. The space between the tubes, I and E, and the space between the tubes, C and J may be closed by bricks, M, arched against one another, as shown in Figs. 1 and 3. v

The forward bricks, M and Il, preferably abut 'the top of the wall, A. v

It will be noted that in this construction all of the ends of the arch tubes are reprefore the same degree of protection for the seams and iues.

Having thus described my invention, I claim as new and desire to secure by Letters Iatentzl. A locomotive boiler firebox having a barrel combustion chamber or extension and having a. throat sheet which rises at the sides of said extension, in combination with inclined arch tubes which extend rearwardly from the portions of said throat sheet at the sides of said extension, other arch tubes extending upwardly and rearwardly from the floor of said extension, a refractory cross wall in said extension and an arch body composed of bricks supported by said tubes.

2. A locomotive boiler irebox having a barrel combustion chamber or extension and having a. throat sheet at the sides of said extension, in combination with inclined arch- Leeease throat sheet, saddle bricks tltted upon the curved portions of said tubes, a cross wall in said extension, and a refractory arch body which extends from one said tube and its saddle brick to the other tube and saddle brick.

3. A locomotive boiler irebox having a barrel combustion chamber or extension and having a throat sheet which rises at the sides of said extension, in combination with inclined arch supporting water circulating tubes which extend rearwardly from the portions of said throat sheet at the sides of said extension, said tubes being curved upwardly adjacent said throat sheet,` saddle bricks conformed to and resting upon respective curved portions of said tubes, other body having parts supported by said tubes In testimony whereof, I have hereunto set' my hand this 1st day of February, 1916. ALFRED H. VVLLETT. 

